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ATTRIBUTE BASED ENCRYPTION IN CLOUD COMPUTING WITH
OUTSOURCED REVOCATION
Manvitha Varsha1
, T. Sree Lakshmi2
1
M.Tech., PG Scholar, Dept of CSE, Korm College of Engineering, Kadapa,Andhra Pradesh.
2
Associate Professor, Dept of CSE,Korm College of Engineering, Kadapa, Andhra Pradesh.
ABSTRACT:
Public key infrastructure (PKI) is an alternate option to public key encryption where as the Identity-Based
Encryption IBE is public key and certificate management. The main disadvantage of IBE during revocation is the
overhead computation at private key generator (PKG).In this paper, going for survey on distinct method for
handling the basic issue of Identity renouncement. Identity Based Encryption (IBE) simplifies public key
management and certificate management at Public Key Infrastructure (PKI) with help of Private Key Generator
(PKG). However,one of the main drawback of IBE is overheaded computation at PKG during user revocation.
The use of Key update cloud service provider (KU-CSP) offloads most of key generation operations during key-
issuing and key-update process leaving only a number of simple operations for PKG and users to perform
locally.For this,we generate a hybrid private key for each user, in which an AND gate is used to connect and
bound the identity component and time component.But KU-CSP is untrusted. So, we propose a Pseudonym
Generation Scheme for Identity based Encryption and Outsourced Revocation in Cloud Computing. We also
discussed our proposed work which bring outsourcing calculation into IBE interestingly and propose a revocable
IBE plan in the server-helped setting. Our plan offloads a large portion of the key era related operations amid key-
issuing and key-redesign forms to a Key Update Cloud Service Provider, leaving just a consistent number of basic
operations for PKG and clients to perform locally. Moreover, we propose another development which is provable
secure under the as of late formulized Refereed handing over of Computation model. We also discussed our
proposed work which bring outsourcing calculation into IBE interestingly and propose a revocable IBE plan in
the server-helped setting. Our plan offloads a large portion of the key era related operations amid key-issuing and
key-redesign forms to a Key Update Cloud Service Provider, leaving just a consistent number of basic operations
for PKG and clients to perform locally. Moreover, we propose another development which is provable secure
under the as of late formulized Refereed handing over of Computation model.
Index Terms-
1. INTRODUCTION
Identity based encryption system allow any user to
generate a public key from a known identity value such
as an ASCII string. There is trusted third party, called
the Private Key Generator (PKG), who generates the
corresponding private keys. For encryption and
decryption operations, PKG first publishes a master
public key, and then generate the
corresponding master private key (referred as master
key). Using this master public key, any user can
generate a public key corresponding to the identity by
combining the master public key with the identity
value. To get a corresponding private key, authorized
user can use identity ID contacts PKG, which uses the
master private key to generate private key for identity
ID. As a result, user can encrypt messages with no prior
distribution of keys between participants. This is very
useful in cases where predistribution of keys is
inconvenient because of technical restraints. However,
for decryption of message, the authorized user must
obtain an appropriate private key from PKG. In this
approach the problem is that PKG must be highly
trusted, as it has ability to generate any users private key
and decryption of message without authorization.
Because any user’s private key can be generated using
third party’s secret, this system has inherent key
assurance. A different systems have been proposed
which remove this including certificate-based
encryption and secure key issuing cryptography. In PKI
setting, revocation is done by appending validity
periods to certificates or using combinations of
techniques. But, this require management of certificates
which is precisely the burden that IBE strives to
alleviate. Boneh and Franklin suggested that their
private keys can renewed by user periodically and
senders use receivers identity with current time
period.But this mechanism would results in an
overhead at PKG. In another word, all the users even
though their keys have been revoked or not, have to
contact with private key generator( PKG) periodically
to prove their identities and update new private keys. It
is needed that PKG must be online and the secure
channel has to be maintained for all the transactions,
which will become a bottleneck for IBE system as the
number of users grows. Many businesses large and
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small use cloud computing today either directly or
indirectly instead of traditional onsite alternatives.
There are a number of reasons like Reduction of
costs,Universal access and many more because of
which cloud computing is so widely used among
businesses today. Thus it require a new working
paradigm for introducing cloud services into IBE
revocation to fix the issue of efficiency and storage
overhead. A naive approach is hand over the private key
generators (PKG) master key to the Cloud Service
Providers (CSPs). The CSPs then simply update all
private keys by using the traditional key update
technique and transfer the private keys to unrevoked
users. However, this approach is based on an unrealistic
assumption that CSPs are fully trusted and are allowed
to access the master key for IBE system. But, in practice
the public clouds are likely outside of the same trusted
domain of users and are curious about users individual
privacy. For this reason, a challenge is how to design a
secure revocable IBE scheme so that we can reduce the
overhead computation at PKG with an untrusted CSP is
raised.
II. RELATED WORK
A Identity-Based Encryption (IBE) is an interesting
alternative to public key encryption, which simplify
key management in a certificate-based Public Key
Infrastructure (PKI) with use of human-intelligible
identities (e.g., unique name, IP address ,email
address,, etc) as a public keys. D. Boneh and M.
Franklin propose a fully functional identity-based
encryption scheme (IBE). The scheme has chosen
ciphertext security in the random oracle model
assuming an elliptic curve variant of the
computational Diffie-Hellman problem. System is
based on the Weil pairing and give precise definitions
for secure identity based encryption schemes and give
several applications for such systems[1]. A. Sahai and
B. Waters introduce a new type of Identity-Based
Encryption (IBE) scheme that we call Fuzzy Identity-
Based Encryption. In Fuzzy IBE an identity Is viewed
as set of descriptive attributes. A Fuzzy IBE scheme
allows for a private key for an identity, ID, to decrypt
a cipher text encrypted with an identity, ID’ , if and
only if the identities ID and ID’,are close to each other
as measured by the set overlap distance metric[2]. The
availability of fast and reliable Digital Identities is an
essential ingredient for the successful implementation
of the public-key infrastructure of the Internet. All
digital identity schemes must include a method for
revoking someone’s digital identity in the case that
this identity is stolen (or canceled) before its
expiration date (similar to the cancelation of a credit-
cards in the case that they are stolen). W. Aiello, S.
Lodha, and R. Ostrovsky proposed an elegant method
of identity revocation which requires very little
communication between users and verifiers in the
system They reduced the overall CA to Directory
communication, while still maintaining the same tiny
user to vendor communication[3]..
III.PROPOSED SYSTEM
The proposed system is Pseudonym Generation
Scheme with Combining the Identity based encryption
and
Attribute-based Encryption with Outsourced
Revocation in Cloud Computing. we use multiple KU-
CSP for key updation. For data security, use an efficient
encryption algorithm. For integrity checking, generate
meta data before upload the data in cloud. Using the
meta data the integrity of the file is verified. In
proposed work, we design a method in which each user
takes a different pseudonym when accessing cloud
services. There is almost no relationship between a user
identity and a corresponding pseudonym is provided,
and no relationship is provided between the
pseudonyms for a single. Pseudonym use will not affect
users attestation also reduces the amount of input data
representing private
user information thus making it almost impossible for
attackers to attack on users. In cloud data is stored
remotely, user is not aware of any security threat. Data
modification can done by the untrusted server
,unauthorized user or by some malicious activity. So
user needs to be ensured that their data are intact. For
this it is important to check integrity of data. for this
proposed system generate meta data and using this meta
data we examine the accuracy of data.
Proposed Algorithms :
Pseudonym Generation algorithm
1.User Identity ID is given as intial input.
2.check wether pseudonym is already generated or not.
3.If yes then give message pseudonym is already
generated.
4.If not chose type of pseudonym
Alpha/Numeric/Alphanumeric.
5.Use random function to generate random number.
6.Generate pseudonym using random number generated
in step 5.
7.Return pseudonym.
Key Generation Algorithm
1.select randomly two large prime number p,q
2.Compute n=p*q. Where n is modulus used to generate
public key and private key.
3.Compute the function as Ψ(n) = (p*1)(q*1).
4.Select any random number e between 1 and (n) the
function value previously calculated in step
3 such that the number is co-prime to '(n) and is not
divisor of Ψ (n).
5.Calculate d,which represent modular multiplicative
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inverse of e mod Ψ (n).
i.e d should satisfy equation e*d mod Ψ (n) =1.
6.private key is represented by d calculated in step 5.
V.RESULTS
In this section we present the Module description, how
it works, practical results and environment. Pseudonym
Generation : we generate pseudonym for each user. It
take users identity and provide
pseudonym.Pseudonyms are usually taken or adopted to
hide an individual ones real identity, for example
writers’ pen names, or terrorists, and computer hackers
fake names. Actors, musicians, and other performers
sometimes uses stage names, for example, to hide their
ethnic backgrounds. Here we use pseudonym for hide
users real identity. Because KU-CSP is untrusted. So
adversaries can use the data without permission based
on users identity. So we generate pseudonym.
Key Generation : For each users private key request on
identity ID, PKG firstly checks whether the request
identity ID exists in revocation list RL, if so the key
generation is aborted. then it generates Private Key (PK)
and Outsourcig Key (OK).finally, it sends Private Key
to user and Pseudonym with Outsourcing key to KU-
CSP respectively.
Encryption : user wants to upload any file or message to
KUCSP. But KU-CSP is untrusted. So encryption is
compulsory.for security we use attribute based
encryption with identity based encryption scheme.Here
a user can encrypt a message M under Pseudonym P
with attributes and time period Ti. This provides the
ciphertext (CT). Then user can upload this ciphertext to
KU-CSP.
Decryption : user wants to download any file or
message from KU-CSP.user uses his private key send
by PKG and decrypt the message. Here the ciphertext
CT is encrypted under P with attributes and Ti, and the
user has a private key PK, this provides original
message M.
Revocation : If the private keys of some users get
compromised, PKG must provide a mean to revoke
such users from system.If users with identities in the set
that are to be revoked at time period Ti, PKG updates
the revocation list as RL as well as the time list TL
through linking the newly created time period Ti+1 onto
original list TL. Finally send a copy for the updated
revocation list RL as well as the new time period Ti+1
to KU-CSP.
Key Updation : Upon receiving a key-update request on
pseudonym, firstly KU-CSP checks whether ID exists in
the revocation list RL, if so KU-CSP returns null and
key-update is aborted. Otherwise it returns Updated Key
(TK) and keyupdate is KU-CSP fetches the
corresponding entry Id with outsourcing key in the user
list UL. In this section we provide the Results on basis of
Construction of Proposed system. We evaluate Time
required to respond by single CSP compared to time
required by multiple CSP.
VI.CONCLUSION AND FUTURE
Focusing on issue of identity revocation, we have
introduced outsourcing computation into IBE and
proposed a revocable scheme in which the revocation
operations are delegated to CSP. User needs not to
contact with PKG during key-update, in other words,
PKG is allowed to be offline after sending the
revocation list to KU-CSP. It do not require secure
channel or user authentication during key-update
between user and KU-CSP. Furthermore as KUCSP
is untrusted we use pseudonym for each user so that
adversary can not get real identity of user.we
combine the Identitybased and Attribute-based
Encryption which will provide more security to
user.For integrity checking, generate meta data
before upload the data in cloud. Using this meta data
the integrity of the file is verified
REFERENCES
[1] W Aiello, S Lodha, & R Ostrovsky. (1998). Fast
digital identity revocation. Advances in
Cryptology – CRYPTO’98. Springer.
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Cryptology – CRYPTO 2001 (LNCS). Berlin:
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©IAETSD 201617

In: Proceedings of the 15th ACM Conf. on Comp. and
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